ip_tunnel: Set itn->fb_tunnel_dev to NULL in ip_tunnel_delete_net().

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ip_tunnel_dellink() ignores itn->fb_tunnel_dev, so the per-netns
fallback tunnel device cannot be removed by userspace.

This also makes default_device_exit_batch() impossible to remove
the device since it calls ->dellink().

So, ip_tunnel_delete_net() has to iterate devices in the dying netns
and call unregister_netdevice_queue() directly.

But then, this duplicates ip_tunnel_del() in ip_tunnel_dellink()
and ip_tunnel_uninit().

Let's set itn->fb_tunnel_dev to NULL in ip_tunnel_delete_net() and
remove for_each_netdev_safe() in ip_tunnel_delete_net().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260912230043.2586313-3-kuniyu@google.com
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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This commit is contained in:

Kuniyuki Iwashima 2026-09-12 23:00:28 +00:00 • committed by Paolo Abeni

parent 578fefdbbd

commit 0239bd767b

1 changed files with 4 additions and 13 deletions

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17

net/ipv4/ip_tunnel.c

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